XmlTextWriter.WriteStartElement(String, String, String) メソッド

定義

名前空間:
System.Xml
アセンブリ:
netstandard.dll, System.Xml.ReaderWriter.dll
アセンブリ:
System.Xml.ReaderWriter.dll
アセンブリ:
System.Xml.dll
アセンブリ:
netstandard.dll
ソース:
XmlTextWriter.cs
ソース:
XmlTextWriter.cs
ソース:
XmlTextWriter.cs
ソース:
XmlTextWriter.cs
ソース:
XmlTextWriter.cs

指定した開始タグを書き込み、指定された名前空間とプレフィックスに関連付けます。

public:
 override void WriteStartElement(System::String ^ prefix, System::String ^ localName, System::String ^ ns);
public override void WriteStartElement(string? prefix, string localName, string? ns);
public override void WriteStartElement(string prefix, string localName, string ns);
override this.WriteStartElement : string * string * string -> unit
Public Overrides Sub WriteStartElement (prefix As String, localName As String, ns As String)

パラメーター

prefix
String

要素の名前空間プレフィックス。

localName
String

要素のローカル名。

ns
String

要素に関連付ける名前空間 URI。 この名前空間が既にスコープ内にあり、プレフィックスが関連付けられている場合、ライターはそのプレフィックスも自動的に書き込みます。

例外

InvalidOperationException

ライターが閉じられます。

例

次の例では、書籍を書き出します。

using System;
using System.IO;
using System.Xml;

public class Sample
{
  private const string filename = "sampledata.xml";

  public static void Main()
  {

     XmlTextWriter writer = new XmlTextWriter (filename, null);
     //Use indenting for readability.
     writer.Formatting = Formatting.Indented;

     writer.WriteComment("sample XML fragment");

     //Write an element (this one is the root).
     writer.WriteStartElement("bookstore");

     //Write the namespace declaration.
     writer.WriteAttributeString("xmlns", "bk", null, "urn:samples");

     writer.WriteStartElement("book");

     //Lookup the prefix and then write the ISBN attribute.
     string prefix = writer.LookupPrefix("urn:samples");
     writer.WriteStartAttribute(prefix, "ISBN", "urn:samples");
     writer.WriteString("1-861003-78");
     writer.WriteEndAttribute();

     //Write the title.
     writer.WriteStartElement("title");
     writer.WriteString("The Handmaid's Tale");
     writer.WriteEndElement();

     //Write the price.
     writer.WriteElementString("price", "19.95");

     //Write the style element.
     writer.WriteStartElement(prefix, "style", "urn:samples");
     writer.WriteString("hardcover");
     writer.WriteEndElement();

     //Write the end tag for the book element.
     writer.WriteEndElement();

     //Write the close tag for the root element.
     writer.WriteEndElement();

     //Write the XML to file and close the writer.
     writer.Flush();
     writer.Close();

     //Read the file back in and parse to ensure well formed XML.
     XmlDocument doc = new XmlDocument();
     //Preserve white space for readability.
     doc.PreserveWhitespace = true;
     //Load the file
     doc.Load(filename);

     //Write the XML content to the console.
     Console.Write(doc.InnerXml);
  }
}

Option Strict
Option Explicit

Imports System.IO
Imports System.Xml

Public Class Sample
    Private Shared filename As String = "sampledata.xml"
    Public Shared Sub Main()
        
        Dim writer As New XmlTextWriter(filename, Nothing)
        'Use indenting for readability.
        writer.Formatting = Formatting.Indented
        
        writer.WriteComment("sample XML fragment")
        
        'Write an element (this one is the root).
        writer.WriteStartElement("bookstore")
        
        'Write the namespace declaration.
        writer.WriteAttributeString("xmlns", "bk", Nothing, "urn:samples")
        
        writer.WriteStartElement("book")
        
        'Lookup the prefix and then write the ISBN attribute.
        Dim prefix As String = writer.LookupPrefix("urn:samples")
        writer.WriteStartAttribute(prefix, "ISBN", "urn:samples")
        writer.WriteString("1-861003-78")
        writer.WriteEndAttribute()
        
        'Write the title.
        writer.WriteStartElement("title")
        writer.WriteString("The Handmaid's Tale")
        writer.WriteEndElement()
        
        'Write the price.
        writer.WriteElementString("price", "19.95")
        
        'Write the style element.
        writer.WriteStartElement(prefix, "style", "urn:samples")
        writer.WriteString("hardcover")
        writer.WriteEndElement()
        
        'Write the end tag for the book element.
        writer.WriteEndElement()
        
        'Write the close tag for the root element.
        writer.WriteEndElement()
        
        'Write the XML to file and close the writer.
        writer.Flush()
        writer.Close()
        
        'Read the file back in and parse to ensure well formed XML.
        Dim doc As New XmlDocument()
        'Preserve white space for readability.
        doc.PreserveWhitespace = True
        'Load the file.
        doc.Load(filename)
        
        'Write the XML content to the console.
        Console.Write(doc.InnerXml)
    End Sub
End Class

注釈

Note

新しい機能を利用するには、XmlWriter メソッドと XmlWriter.Create クラスを使用してXmlWriterSettings インスタンスを作成することをお勧めします。

このメソッドを呼び出した後は、属性を記述するか、子要素の WriteComment、 WriteString、または WriteStartElement を使用してコンテンツを作成できます。 終了タグが書き出された時点で、 WriteEndElement を使用して要素を閉じます。

適用対象